I can't generate pitchipoy armature
The automatic rig generating scripts are only designed to work with the provided meta rigs. While there is some ability to alter the rigs, they tend to be very specific about bone names and parenting relationships.

You will need to replace the bone/s that you deleted and probably get the parenting configured to match the original rig. This could mean it is easier to add a new meta rig and start again.

Even if you don't want to use all of the bones provided, you can leave them there and not weight paint them to any part of your mesh. Then you can place the bones on a separate bone layer that you can leave hidden so that they aren't in your way when you are animating.